[coldtea]

>Now I'm a little worried that if my situation doesn't change, my career would suffer. I've started to watch a few videos online about design. But I'm not sure if they're going to really help as they usually talk about very basics which doesn't help in real world coding.

Check the PRs and read the existing code from others inside the company. Presumably those meet the company's standards, and will give you hints how to structure yours.

Read a couple of industry standard books like Clean Code and Code Complete too.